Joey Fatone is saying bye, bye, bye to the contents of his Orlando home -- in the form of a MASSIVE estate sale this weekend -- featuring all sorts of awesome crap ... like the SWORD OF OMENS!

TMZ has learned the Fatone family is moving and EVERYTHING must go -- including Joey's Death Star replica, his personal Sword of Omens from Thundercats, arcade games, furniture, art, dishes, grill utensils ... all the way down to his clothes and shoes.

In fact ... since everything in the house is marked with price tags -- it looks like the only thing not included in the sale is the kitchen sink.